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Event A and event B are independent event. If the probability that even A occurs is 0.4 and event B occurs is 0.3, what will be the probability that at least one event occurs?

Give your answer as a decimal.
Set A, B, and C are subsets of a universal set U, as represented by the circular regions in the following diagrams. The set $$\overline{B}$$ consists of the elements in U that are not in B, and the set $$\overline{C}$$ consists of the elements in U that are not in C. The set A∩((B∩$$\overline{C}$$)∪(C∩$$\overline{B}$$)) is represented by the shaded regions in which of the following diagrams?



The daily high temperature, in degrees Fahrenheit, in a certain city were recorded for 11 consecutive days. The table above shows the frequency distribution of the recorded temperatures. Which of the following statements are true?

Indicate all such statements.


Quantity A

AB

Quantity B

BC




The figure ABCDOE above consists of a large semicircle ABC with center O and two small semicircles AEO and ODC. If the area of figure ABCDOE is 48π, what is the length of diameter AC?


The circle on the left has radius r and center O, and the circle on the right has radius s and center P. The lengths of arcs ABC and DEF are both equal to 3, and r < s < 3.

Quantity A

x

Quantity B

y


A plot of land used to display flowers in a botanical garden was designed in the shape of a trapezoid in which the lengths of the two sides that are not parallel are equal. The length of the longer parallel side is 5 times the length of the shorter parallel side, and the distance between the two parallel sides is 3 times the length of the shorter parallel side. The perimeter of the plot is 135 meters. Approximately what is the length, in meters, of the shorter parallel side?


The figure above represents a pond and the nearby land that surrounds it. Lucia plans to measure the distance across the pond from point A to point B. First, she will measure the distance from a rock on land at point R to point D on line AR. Next, she will measure the distance, along a line parallel to line AB, from point D to point C, which lies on line BR. Of the following, which additional measurement will be sufficient to determine the distance from A to B?


Quantity A

RS

Quantity B

3




What's the height of the unknown altitude?

Give your answer as a fraction.


In an equilateral triangle ABC,three points P,Q and R are on the side AB,AC and BC, respectively.

Quantity A

The sum of any two interior angles in Δ ABC

Quantity B

The sum of any two interior angles in Δ PQR




Quantity A

a

Quantity B

b




Quantity A

x

Quantity B

90


Quantity A

$$(x-0.7)^{2}$$

Quantity B

$$(0.7-x)^{2}$$




The average (arithmetic mean) value of x in the frequency distribution above is 0. If a value of x is to be selected at random from the distribution, which of the following events is most likely?

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